横撑布置对六管拱肋钢管混凝土拱桥动力和稳定性的影响
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摘要
根据国内已建成的钢管混凝土拱桥,构造了跨径为400 m的六管拱肋钢管混凝土拱桥,运用通用有限元分析软件ANSYS建立空间有限元计算模型,分8种工况计算了该桥的动力特性和稳定安全系数,对比分析了横撑的位置、形式及数量等因素对这类型桥梁结构的动力性能和稳定性能的影响.计算结果表明,大跨度钢管混凝土拱桥的拱脚和拱顶必须设置横向联系,拱脚横撑对面内基频的影响不大,对面外基频和结构稳定性影响大,而拱顶横撑对面外基频、面内竖弯基频以及稳定性影响不大,但对扭转基频影响显著,另外,"K"撑对动力和稳定性能的影响比"米"撑显著,建议在不改变横撑数量的情况下优先采用"K"撑.
Referring to arch ribs of concrete-filled steel tubular(CFST) arch bridges which have been built in China,the spacial finite element calculating model of a CFST arch bridge with span of 400m was set up by using common software ANSYS.Based on 8 operating mode,the dynamic performance and steady safety factor were calculated,and the effects of location,formation and quantity of crossbars on dynamic and stable characteristics were compared and analyzed.The results showed that transverse affiliations must be setup for arch springing and crown of large-span CFST arch bridge.Arch springing crossbar have less effects on in-plane basic-frequency than that on out-of-plane basic-frequency and structural stability.Arch crown crossbar have little influence on out-of-plane basic-frequency,vertical basic-frequency and stability than that on torsional basic-frequency.K-shaped crossbar which was suggested when the quantity of crossbars was hardly changed had more obvious influence on the dynamic and stable characteristics than 米-shaped crossbar.
Referring to arch ribs of concrete-filled steel tubular(CFST) arch bridges which have been built in China,the spacial finite element calculating model of a CFST arch bridge with span of 400m was set up by using common software ANSYS.Based on 8 operating mode,the dynamic performance and steady safety factor were calculated,and the effects of location,formation and quantity of crossbars on dynamic and stable characteristics were compared and analyzed.The results showed that transverse affiliations must be setup for arch springing and crown of large-span CFST arch bridge.Arch springing crossbar have less effects on in-plane basic-frequency than that on out-of-plane basic-frequency and structural stability.Arch crown crossbar have little influence on out-of-plane basic-frequency,vertical basic-frequency and stability than that on torsional basic-frequency.K-shaped crossbar which was suggested when the quantity of crossbars was hardly changed had more obvious influence on the dynamic and stable characteristics than 米-shaped crossbar.
引文
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[4]赵跃宇,金波,劳文全.横撑对钢管混凝土拱桥力学性能的影响分析[J].湖南交通科技,2006,32(3):100-102.
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[2]陈水盛,陈宝春.钢管混凝土拱桥动力特性分析[J].公路,2001,(2):10-14.
[3]欧碧峰,赵灿晖,乐建平.大跨度钢管混凝土拱桥的动力特性分析[J].公路交通技术,2005,(3):84-87.
[4]赵跃宇,金波,劳文全.横撑对钢管混凝土拱桥力学性能的影响分析[J].湖南交通科技,2006,32(3):100-102.
[5]吕建根,赵跃宇.有推力钢管混凝土拱桥的动力特性分析[J].公路交通科技,2006,(3):100-102.
[6]尹浩辉,吴滨生.丫髻沙大桥主拱拱肋钢管混凝土的灌注与线形控制[J].桥梁建设,2000,(4):49-51.
[7]陈宝春,韦建刚.钢管混凝土(单圆管)拱肋刚度对其动力特性的影响[J].地震工程与工程振动,2004,24(3):105-109.
[8]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1992.
[9]陈宝春.钢管混凝土拱桥计算理论研究进展[J].土木工程学报,2003,36(12):47-57.
[10]梅青.大跨度上承式钢管混凝土拱桥的稳定性分析与计算[D].南京:东南大学,2000.
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